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(Tcl) Decrypt a SAML Response

Demonstrates how to decrypt a SAML response.

Note: This example requires Chilkat v9.5.0.76 or greater.

Chilkat Tcl Extension Downloads

Chilkat Tcl Extension Downloads

load ./chilkat.dll

#  This example requires the Chilkat API to have been previously unlocked.
#  See Global Unlock Sample for sample code.

#  This example decrypts this SAML response:

#  <?xml version="1.0" encoding="UTF-8" ?>
#  <saml2p:Response Destination="https://deskflow-asp2.com/ubc/ubcdfe.dll/cwlacs" ID="_e4585eaeedbcaf7c24dff7f1ee2499f5" IssueInstant="2018-10-11T17:46:20.727Z" Version="2.0" xmlns:saml2p="urn:oasis:names:tc:SAML:2.0:protocol">
#      <saml2:Issuer xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion">https://authentication.stg.id.ubc.ca</saml2:Issuer>
#      <ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
#          <ds:SignedInfo>
#              <ds:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
#              <ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256"/>
#              <ds:Reference URI="#_e4585eaeedbcaf7c24dff7f1ee2499f5">
#                  <ds:Transforms>
#                      <ds:Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/>
#                      <ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
#                  </ds:Transforms>
#                  <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/>
#                  <ds:DigestValue>1ui22tqFyYEOoWI19CMwz4n+ynxNjLDGdTeRMdi60EU=</ds:DigestValue>
#              </ds:Reference>
#          </ds:SignedInfo>
#          <ds:SignatureValue>ROg7FXV6vsp8socVhdo76/i7cRHGGKIveAiScKdujZT0QrHVqIvvbZ/RnwvEMJ9H9i/kJFAQA171
#  		Eo2kDjSdvNFQ/YcKaJUwMtAwT05yVatGV42RZKEf7ME+vpcCTR1LWZdrhat1FWCg1MNQwNWB0EL5
#  		fEP2a4jAcSTB8tFbjTAHsv7IWC39E5RVv99mACYXLa7iGZLtORANZxgYu5qQgmH6pUkI6Z1cpmf+
#  		m9mIjKM6LF0EvLfWOBWL6udZ+GsHPOLjVTJg+1S0xb9FQCYDVW1QhbjSS0icKHKTNNbrsaxllVDY
#  		m4q27YQjRh+XxugPgvsZ61Pxlto8Jbg+6jUlMQ==</ds:SignatureValue>
#          <ds:KeyInfo>
#              <ds:X509Data>
#                  <ds:X509Certificate>MIIDTTCCAjWgAwIBAgIVAJccYyIV6wly8XyddumpgnHMJ2JLMA0GCSqGSIb3DQEBCwUAMCcxJTAj
#  			BgNVBAMMHGF1dGhlbnRpY2F0aW9uLnN0Zy5pZC51YmMuY2EwHhcNMTcwMzAxMTk1NDM0WhcNMzcw
#  			...
#  			xUuh6HuHKIwQqHBz7udxbH3Zbb6jXGDJjiDHt1LRJ8xbVisFIcDlIwsGQQi0HeEJfx4P</ds:X509Certificate>
#              </ds:X509Data>
#          </ds:KeyInfo>
#      </ds:Signature>
#      <saml2p:Status>
#          <saml2p:StatusCode Value="urn:oasis:names:tc:SAML:2.0:status:Success"/>
#      </saml2p:Status>
#      <saml2:EncryptedAssertion xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion">
#          <xenc:EncryptedData Id="_314d80b9cf02d8eda8d686a6ffd626cf" Type="http://www.w3.org/2001/04/xmlenc#Element" xmlns:xenc="http://www.w3.org/2001/04/xmlenc#">
#              <xenc:EncryptionMethod Algorithm="http://www.w3.org/2001/04/xmlenc#aes128-cbc" xmlns:xenc="http://www.w3.org/2001/04/xmlenc#"/>
#              <ds:KeyInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
#                  <xenc:EncryptedKey Id="_d7b6da6fb59a627ebb4a96928441ab79" Recipient="https://ubcdfe.deskflow-asp2.com" xmlns:xenc="http://www.w3.org/2001/04/xmlenc#">
#                      <xenc:EncryptionMethod Algorithm="http://www.w3.org/2001/04/xmlenc#rsa-oaep-mgf1p" xmlns:xenc="http://www.w3.org/2001/04/xmlenc#">
#                          <ds:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1" xmlns:ds="http://www.w3.org/2000/09/xmldsig#"/>
#                      </xenc:EncryptionMethod>
#                      <ds:KeyInfo>
#                          <ds:X509Data>
#                              <ds:X509Certificate>MIICuzCCAiQCCQD3bpigRnKMSzANBgkqhkiG9w0BAQsFADCBoTELMAkGA1UEBhMCQ0ExEDAOBgNV
#  				BAgMB09udGFyaW8xEDAOBgNVBAcMB1Rvcm9udG8xJjAkBgNVBAoMHVRhY3RpY2FsIEJ1c2luZXNz
#  				...
#  				kVRcHd1UK3q7G8FoykWjdQz/0EoMTfEZ+Md56mLOe48eMUZV2ONZuL1kDCEKw1UwkaDQI4Pf8pzx
#  				82b9rgw9wBDtvu5eFPlUGEGIBw==</ds:X509Certificate>
#                          </ds:X509Data>
#                      </ds:KeyInfo>
#                      <xenc:CipherData xmlns:xenc="http://www.w3.org/2001/04/xmlenc#">
#                          <xenc:CipherValue>BNHfUOpgdPE5BgpN2VIZIDthMAv1rxk91qVnWyCZOG9bmUKChJtTUqMpndot7VJwYuyKFshkAdnT
#  				D79KGdlSA1xHKcVeZXXzDWglqSyYjzhDCsyOhPaI4HelMFgCLwyFz89uEpUpqlvfl8ol3Am/XnzQ
#  				Vp7V7oS76hocjUI51Qs=</xenc:CipherValue>
#                      </xenc:CipherData>
#                  </xenc:EncryptedKey>
#              </ds:KeyInfo>
#              <xenc:CipherData xmlns:xenc="http://www.w3.org/2001/04/xmlenc#">
#                  <xenc:CipherValue>R6l7tmbnXrOfBgB8lA3KnwLYsLH5ZO5omQ7Hp5K05atzw2o55xmCXVMYhNneFxMtxUh6raEyHeZX
#  			PTZNgWrvdqc4GYND/R7MhRrJzk9OAq1WyoOXwbtRpwNDwWA4N2IuprPQJbvjVxaw/PesZMZwZqlp
#  			...
#  			zm9zAxahyu8Ooe8M4r3HN2cY0JxxxkZtDiulbnyA+rRtXfBRJtangvFQ4iFAnzM/Yg9hMyW9jcu0
#  			S7FzuRB9ONMxi+nh0IFWgqp+</xenc:CipherValue>
#              </xenc:CipherData>
#          </xenc:EncryptedData>
#      </saml2:EncryptedAssertion>
#  </saml2p:Response>

#  The sample encrypted SAML response and RSA private key are available online:
set http [new_CkHttp]

set sbSamlResponse [new_CkStringBuilder]

set sbPrivateKeyPem [new_CkStringBuilder]

set success [CkHttp_QuickGetSb $http "https://chilkatdownload.com/data/samlresponse.xml" $sbSamlResponse]
if {[expr $success == 1]} then {
    set success [CkHttp_QuickGetSb $http "https://chilkatdownload.com/data/samlresponse_privkey.pem" $sbPrivateKeyPem]
}

if {[expr $success != 1]} then {
    puts [CkHttp_lastErrorText $http]
    delete_CkHttp $http
    delete_CkStringBuilder $sbSamlResponse
    delete_CkStringBuilder $sbPrivateKeyPem
    exit
}

set xml [new_CkXml]

CkXml_LoadSb $xml $sbSamlResponse 1

#  Load the RSA private key..
set privkey [new_CkPrivateKey]

set success [CkPrivateKey_LoadPem $privkey [CkStringBuilder_getAsString $sbPrivateKeyPem]]
if {[expr $success != 1]} then {
    puts [CkPrivateKey_lastErrorText $privkey]
    delete_CkHttp $http
    delete_CkStringBuilder $sbSamlResponse
    delete_CkStringBuilder $sbPrivateKeyPem
    delete_CkXml $xml
    delete_CkPrivateKey $privkey
    exit
}

#  Prepare an RSA object w/ the private key...
set rsa [new_CkRsa]

set success [CkRsa_ImportPrivateKeyObj $rsa $privkey]
if {[expr $success != 1]} then {
    puts [CkRsa_lastErrorText $rsa]
    delete_CkHttp $http
    delete_CkStringBuilder $sbSamlResponse
    delete_CkStringBuilder $sbPrivateKeyPem
    delete_CkXml $xml
    delete_CkPrivateKey $privkey
    delete_CkRsa $rsa
    exit
}

#  RSA will be used to decrypt the xenc:EncryptedKey
#  The bytes to be decrypted are in xenc:CipherValue (in base64 format)
set encryptedAesKey [CkXml_getChildContent $xml "saml2:EncryptedAssertion|xenc:EncryptedData|ds:KeyInfo|xenc:EncryptedKey|xenc:CipherData|xenc:CipherValue"]
if {[expr [CkXml_get_LastMethodSuccess $xml] != 1]} then {
    puts "Encrypted AES key not found."
    delete_CkHttp $http
    delete_CkStringBuilder $sbSamlResponse
    delete_CkStringBuilder $sbPrivateKeyPem
    delete_CkXml $xml
    delete_CkPrivateKey $privkey
    delete_CkRsa $rsa
    exit
}

puts "Encrypted AES key (base64) = $encryptedAesKey"

set bdAesKey [new_CkBinData]

CkBinData_AppendEncoded $bdAesKey $encryptedAesKey "base64"

set sbRsaAlg [new_CkStringBuilder]

CkStringBuilder_Append $sbRsaAlg [CkXml_chilkatPath $xml "saml2:EncryptedAssertion|xenc:EncryptedData|ds:KeyInfo|xenc:EncryptedKey|xenc:EncryptionMethod|(Algorithm)"]
puts "sbRsaAlg contains: [CkStringBuilder_getAsString $sbRsaAlg]"
if {[expr [CkStringBuilder_Contains $sbRsaAlg "rsa-oaep" 1] == 1]} then {
    CkRsa_put_OaepPadding $rsa 1
}

#  Note: The DecryptBd method is introduced in Chilkat v9.5.0.76
set success [CkRsa_DecryptBd $rsa $bdAesKey 1]
if {[expr $success != 1]} then {
    puts [CkRsa_lastErrorText $rsa]
    delete_CkHttp $http
    delete_CkStringBuilder $sbSamlResponse
    delete_CkStringBuilder $sbPrivateKeyPem
    delete_CkXml $xml
    delete_CkPrivateKey $privkey
    delete_CkRsa $rsa
    delete_CkBinData $bdAesKey
    delete_CkStringBuilder $sbRsaAlg
    exit
}

puts "Decrypted AES key (hex) = [CkBinData_getEncoded $bdAesKey hex]"

#  Get the encrypted XML (in base64) to be decrypted w/ the AES key.
set encrypted64 [CkXml_getChildContent $xml "saml2:EncryptedAssertion|xenc:EncryptedData|xenc:CipherData|xenc:CipherValue"]
if {[expr [CkXml_get_LastMethodSuccess $xml] != 1]} then {
    puts "Encrypted data not found."
    delete_CkHttp $http
    delete_CkStringBuilder $sbSamlResponse
    delete_CkStringBuilder $sbPrivateKeyPem
    delete_CkXml $xml
    delete_CkPrivateKey $privkey
    delete_CkRsa $rsa
    delete_CkBinData $bdAesKey
    delete_CkStringBuilder $sbRsaAlg
    exit
}

set bdEncrypted [new_CkBinData]

CkBinData_AppendEncoded $bdEncrypted $encrypted64 "base64"

#  Get the symmetric algorithm:  "http://www.w3.org/2001/04/xmlenc#aes128-cbc"
#  and set the symmetric decrypt properties.
set crypt [new_CkCrypt2]

set sbAlg [new_CkStringBuilder]

CkStringBuilder_Append $sbAlg [CkXml_chilkatPath $xml "saml2:EncryptedAssertion|xenc:EncryptedData|xenc:EncryptionMethod|(Algorithm)"]
if {[expr [CkStringBuilder_Contains $sbAlg "aes128-cbc" 1] == 1]} then {
    CkCrypt2_put_CryptAlgorithm $crypt "aes"
    CkCrypt2_put_KeyLength $crypt 128
    CkCrypt2_put_CipherMode $crypt "cbc"
    #  The 1st 16 bytes of the encrypted data are the AES IV.
    [CkCrypt2_SetEncodedIV $crypt [CkBinData_getEncodedChunk $bdEncrypted 0 16 "hex"] "hex"]
    [CkBinData_RemoveChunk $bdEncrypted 0 16]
}

#  Other algorithms, key lengths, etc, can be supported by checking for different Algorithm attribute values..

CkCrypt2_SetEncodedKey $crypt [CkBinData_getEncoded $bdAesKey "hex"] "hex"

#  AES decrypt...
set success [CkCrypt2_DecryptBd $crypt $bdEncrypted]
if {[expr $success != 1]} then {
    puts [CkCrypt2_lastErrorText $crypt]
    delete_CkHttp $http
    delete_CkStringBuilder $sbSamlResponse
    delete_CkStringBuilder $sbPrivateKeyPem
    delete_CkXml $xml
    delete_CkPrivateKey $privkey
    delete_CkRsa $rsa
    delete_CkBinData $bdAesKey
    delete_CkStringBuilder $sbRsaAlg
    delete_CkBinData $bdEncrypted
    delete_CkCrypt2 $crypt
    delete_CkStringBuilder $sbAlg
    exit
}

#  Get the decrypted XML
set decryptedXml [CkBinData_getString $bdEncrypted "utf-8"]
puts "Decrypted XML:"
puts "$decryptedXml"

#  The decrypted XML looks like this:

#  <saml2:Assertion xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion" ID="_226e565c548db7986d165d7d969b48b4" IssueInstant="2018-10-11T17:46:20.727Z" Version="2.0">
#  ...
#  ...
#  ...
#  </saml2:Assertion>

set xmlAssertion [new_CkXml]

CkXml_LoadXml $xmlAssertion $decryptedXml

#  Replace the saml2:EncryptedAssertion XML subtree with the saml2:Assertion XML.
# xmlEncryptedAssertion is a CkXml
set xmlEncryptedAssertion [CkXml_FindChild $xml "saml2:EncryptedAssertion"]
CkXml_SwapTree $xmlEncryptedAssertion $xmlAssertion
delete_CkXml $xmlEncryptedAssertion

#  The decrypted XML assertion has now replaced the encrypted XML assertion.
#  Examine the fully decrypted XML document:
puts "Full XML SAML document with decrypted assertion:"
puts [CkXml_getXml $xml]

delete_CkHttp $http
delete_CkStringBuilder $sbSamlResponse
delete_CkStringBuilder $sbPrivateKeyPem
delete_CkXml $xml
delete_CkPrivateKey $privkey
delete_CkRsa $rsa
delete_CkBinData $bdAesKey
delete_CkStringBuilder $sbRsaAlg
delete_CkBinData $bdEncrypted
delete_CkCrypt2 $crypt
delete_CkStringBuilder $sbAlg
delete_CkXml $xmlAssertion

 

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